The Treasury Department Federal Credit Union (TDFCU) founded in 1935, is a full service financial institution with a voluntary Board of Directors that is elected by the members.

Membership in the Treasury Department Federal Credit Union is available to employees of the US Treasury Department, Department of Homeland Security, U.S. Courts, United States Securities and Exchange Commission(SEC), CDC National Center for Health Statistics, as well as persons who live, work (or regularly conduct business), worship, or attend school in, and businesses and other legal entities located in, Washington, D.C.

The Treasury Department Federal Credit Union has six full service branches.

TDFCU and several other credit unions were victimized when U.S. Mortgage Corporation sold mortgages that it managed on behalf of the credit union to Fannie Mae and kept the money.

[2] TDFCU lost more than $500,000 in the first nine months of 2008, and some other District of Columbia credit unions also experienced losses.